The Biology Brief
Issue #3 · The Burnout Science Edition · Week 3

Your Nervous System Under Siege

What chronic stress actually does to the human body — and why willpower is the wrong prescription.

📖 ~1,000 words ⏱ 5 min read By Sarah Scahill, RN
What chronic stress actually does to the human body — and why willpower is the wrong prescription.
This Week's Big Idea

**Burnout is not a psychological condition. It is a physiological one.

The distinction changes everything about how you respond to it.**

The language we use shapes the interventions we design. When we call

burnout a 'mental health issue,' we design mental health interventions

— counselling, mindfulness apps, resilience training. When we

understand it as a physiological condition — a measurable

dysregulation of the body's stress response system — we design very

different solutions.


The Science You Need

Polyvagal theory: the map that changes how you read your team.

Stephen Porges' Polyvagal Theory (2011) gives us a neurobiological map

of three states that govern human behaviour under varying levels of

perceived safety and threat. Understanding these three states is

arguably the most practically useful thing a leader can learn about

human performance.

VENTRAL VAGAL (Safe and Social): The nervous system is regulated. The

person is connected, collaborative, creative, empathic, and capable of

complex thought. This is where excellent work happens.

SYMPATHETIC (Fight or Flight): Perceived threat has activated the


The HR & Legal Landscape
This Week's Action

The Mental Health Commission of Canada estimates presenteeism costs

Canadian employers nearly twice what absenteeism does. The challenge is

that absenteeism appears on the budget. Presenteeism doesn't — until

it shows up in error rates, client complaints, quality decline, and the

*Where the science of the human body meets the practice of
Sarah Scahill
RN · MHS · CPHR Candidate · CDMP · CCHNC-C
Founder, ExecRN Integrative Health Solutions
Never miss an issue of The Biology Brief.

Evidence-based insights on the science of human performance at work. Published every Tuesday. Free, always.

Subscribe on LinkedIn →
← Issue #2 All Issues Issue #4 →